ACL2-PC::REPLAY

Examples:
REPLAY -- replay all instructions in the current session
(i.e., state-stack)
(REPLAY 5) -- replay the most recent 5 instructions
(REPLAY 5
(COMMENT deleted dive command here))
-- replace the 5th most recent instruction with the
indicated comment instruction, and then replay it
followed by the remaining 4 instructions

General Form:
(REPLAY &OPTIONAL n replacement-instruction)

Replay the last n instructions if n is a positive integer; else n
should be nil or not supplied, and replay all instructions.
However, if replacement-instruction is supplied and not nil, then
before the replay, replace the nth instruction (from the most
recent, as shown by commands) with replacement-instruction.

If this command ``fails'', then the restore command will revert the
state-stack to its value present before the replay instruction was
executed.